js 获取键盘值用法(兼容IE及Firefox)

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<img src="/_New/_cj/myeditor/sysimage/space.gif" class="ewebeditor__script" _ewebeditor_fake_tag="script" _ewebeditor_fake_value="%3Cscript%20language%3D%22javascript%22%3E%20%0D%0Ans4%20%3D%20(document.layers)%20%3F%20true%20%3A%20false%3B%20%0D%0Aie4%20%3D%20(document.all)%20%3F%20true%20%3A%20false%3B%20%0D%0Afunction%20keyDown(e)%7B%20%0D%0Aif(ns4)%7B%20%0D%0Avar%20nkey%3De.which%3B%20%0D%0Avar%20iekey%3D'%E7%8E%B0%E5%9C%A8%E6%98%AFns%E6%B5%8F%E8%A7%88%E5%99%A8'%3B%20%0D%0Avar%20realkey%3DString.fromCharCode(e.which)%3B%20%0D%0A%7D%20%0D%0Aif(ie4)%7B%20%0D%0Avar%20iekey%3Devent.keyCode%3B%20%0D%0Avar%20nkey%3D'%E7%8E%B0%E5%9C%A8%E6%98%AFie%E6%B5%8F%E8%A7%88%E5%99%A8'%3B%20%0D%0Avar%20realkey%3DString.fromCharCode(event.keyCode)%3B%20%0D%0Aif(event.keyCode%3D%3D32)%7Brealkey%3D'%5C'%20%E7%A9%BA%E6%A0%BC%5C''%7D%20%0D%0Aif(event.keyCode%3D%3D13)%7Brealkey%3D'%5C'%20%E5%9B%9E%E8%BD%A6%5C''%7D%20%0D%0Aif(event.keyCode%3D%3D27)%7Brealkey%3D'%5C'%20Esc%5C''%7D%20%0D%0Aif(event.keyCode%3D%3D16)%7Brealkey%3D'%5C'%20Shift%5C''%7D%20%0D%0Aif(event.keyCode%3D%3D17)%7Brealkey%3D'%5C'%20Ctrl%5C''%7D%20%0D%0Aif(event.keyCode%3D%3D18)%7Brealkey%3D'%5C'%20Alt%5C''%7D%20%0D%0A%7D%20%0D%0Aalert('ns%E6%B5%8F%E8%A7%88%E5%99%A8%E4%B8%AD%E9%94%AE%E5%80%BC%3A'%2Bnkey%2B'%5Cn'%2B'ie%E6%B5%8F%E8%A7%88%E5%99%A8%E4%B8%AD%E9%94%AE%E5%80%BC%3A'%2Biekey%2B'%5Cn'%2B'%E5%AE%9E%E9%99%85%E9%94%AE%E4%B8%BA'%2Brealkey)%3B%20%0D%0A%7D%20%0D%0Adocument.onkeydown%20%3D%20keyDown%3B%20%0D%0Aif(ns4)%7B%20%0D%0Adocument.captureEvents(Event.KEYDOWN)%3B%7D%20%0D%0A%3C%2Fscript%3E"> 
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//Javascript Document 
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<h3>请按任意一个键。。。。</h3> 
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